105 lines
1.9 KiB
NASM
105 lines
1.9 KiB
NASM
struc IDTEntry
|
|
.offsetl resw 1
|
|
.selector resw 1
|
|
.zero resb 1
|
|
.attribute resb 1
|
|
.offseth resw 1
|
|
endstruc
|
|
|
|
SECTION .text
|
|
USE32
|
|
|
|
interrupts:
|
|
.first:
|
|
mov [.entry], byte 0
|
|
jmp dword .handle
|
|
.second:
|
|
%assign i 1
|
|
%rep 255
|
|
mov [.entry], byte i
|
|
jmp dword .handle
|
|
%assign i i+1
|
|
%endrep
|
|
.handle:
|
|
push ebp
|
|
push esi
|
|
push edi
|
|
push edx
|
|
push ecx
|
|
push ebx
|
|
push eax
|
|
|
|
push esp
|
|
push dword [.entry]
|
|
|
|
mov eax, gdt.kernel_data
|
|
mov ds, eax
|
|
mov es, eax
|
|
mov fs, eax
|
|
mov gs, eax
|
|
|
|
call dword [.handler]
|
|
|
|
mov eax, gdt.user_data | 3
|
|
mov ds, eax
|
|
mov es, eax
|
|
mov fs, eax
|
|
mov eax, gdt.user_tls | 3
|
|
mov gs, eax
|
|
|
|
add esp, 8 ; Skip interrupt code and reg pointer
|
|
|
|
pop eax
|
|
pop ebx
|
|
pop ecx
|
|
pop edx
|
|
pop edi
|
|
pop esi
|
|
pop ebp
|
|
|
|
iretd
|
|
|
|
.handler: dd 0
|
|
.entry: dd 0
|
|
|
|
idtr:
|
|
dw (idt.end - idt) + 1
|
|
dd idt
|
|
|
|
idt:
|
|
%assign i 0
|
|
|
|
;Below system call
|
|
%rep 128
|
|
istruc IDTEntry
|
|
at IDTEntry.offsetl, dw interrupts+(interrupts.second-interrupts.first)*i
|
|
at IDTEntry.selector, dw gdt.kernel_code
|
|
at IDTEntry.zero, db 0
|
|
at IDTEntry.attribute, db attrib.present | attrib.interrupt32
|
|
at IDTEntry.offseth, dw 0
|
|
iend
|
|
%assign i i+1
|
|
%endrep
|
|
|
|
;System call
|
|
istruc IDTEntry
|
|
at IDTEntry.offsetl, dw interrupts+(interrupts.second-interrupts.first)*i
|
|
at IDTEntry.selector, dw gdt.kernel_code
|
|
at IDTEntry.zero, db 0
|
|
at IDTEntry.attribute, db attrib.present | attrib.ring3 | attrib.interrupt32
|
|
at IDTEntry.offseth, dw 0
|
|
iend
|
|
%assign i i+1
|
|
|
|
;Above system call
|
|
%rep 127
|
|
istruc IDTEntry
|
|
at IDTEntry.offsetl, dw interrupts+(interrupts.second-interrupts.first)*i
|
|
at IDTEntry.selector, dw gdt.kernel_code
|
|
at IDTEntry.zero, db 0
|
|
at IDTEntry.attribute, db attrib.present | attrib.interrupt32
|
|
at IDTEntry.offseth, dw 0
|
|
iend
|
|
%assign i i+1
|
|
%endrep
|
|
.end:
|